描述
TSXCUSBMBP
我們已經(jīng)知道有的FCS是由PLC發(fā)展而來(lái)，而有的FCS是由DCS發(fā)展而來(lái)，那么，今天FCS已走向?qū)嵱没?，PLC與DCS前景又將如何。
PLC于60年代末期在美國(guó)首先出現(xiàn)，目的是用來(lái)取代繼電器，執(zhí)行邏輯、計(jì)時(shí)、計(jì)數(shù)等順序控制功能，建立柔性程序控制系統(tǒng)。1976年正式命名，并給予定義：PLC是一種數(shù)字控制專用電子計(jì)算機(jī)，它使用了可編程序存儲(chǔ)器儲(chǔ)存指令，執(zhí)行諸如邏輯、順序、計(jì)時(shí)、計(jì)數(shù)與演算等功能，并通過(guò)模擬和數(shù)字輸入、輸出等組件，控制各種機(jī)械或工作程序。經(jīng)過(guò)30多年的發(fā)展，PLC已十分成熟與完善，并開(kāi)發(fā)了模擬量閉環(huán)控制功能。PLC在FCS系統(tǒng)中的地位似乎已被確定并無(wú)多少爭(zhēng)論。IEC推薦的現(xiàn)場(chǎng)總線控制系統(tǒng)體系結(jié)構(gòu),PLC作為一個(gè)站掛在高速總線上。編者以為，輔助車間的控制系統(tǒng)應(yīng)以遵循現(xiàn)場(chǎng)總線通訊協(xié)議的PLC或能與FCS進(jìn)行通訊交換信息的PLC為優(yōu)選對(duì)象。
自1973年提出第一臺(tái)以微處理器為基礎(chǔ)的控制器以來(lái)，它逐步完善，并最終形成功能齊全、安全可*的數(shù)字式分散控制系統(tǒng)DCS。它的性能大大優(yōu)于以住任何一種控制系統(tǒng)?？梢詽M足火電廠DAS、MCS、SCS和APS各系統(tǒng)的各種要求，目前還可以通過(guò)工業(yè)以太網(wǎng)建立管理層網(wǎng)絡(luò)，以滿足火電廠呼聲越來(lái)越高的加強(qiáng)管理的要求?？梢赃@樣說(shuō)，DCS系統(tǒng)的監(jiān)控可以復(fù)蓋大型火電機(jī)組的工藝全過(guò)程。
但是，自從有了FCS，并于90年代走向?qū)嵱没詠?lái)，不斷有如下論點(diǎn)在公開(kāi)刊物上發(fā)表，即：“從現(xiàn)在起，新的現(xiàn)場(chǎng)總線控制系統(tǒng)FCS將逐步取代傳統(tǒng)的DCS”；“當(dāng)調(diào)節(jié)功能下放到現(xiàn)場(chǎng)去以后，傳統(tǒng)的DCS就沒(méi)有存在的必要而會(huì)自動(dòng)消失”；“今后十年，傳統(tǒng)的4~20mA模擬信號(hào)制將逐步被雙向數(shù)字通信現(xiàn)場(chǎng)總線信號(hào)制所取代，模擬與數(shù)字的分散型控制系統(tǒng)DCS將更新?lián)Q代為全數(shù)字現(xiàn)場(chǎng)總線控制系統(tǒng)FCS”……。這些論點(diǎn)歸納為一句話：FCS將取代DCS，DCS從此將消亡。
上述論點(diǎn)皆出自于權(quán)威專家之口，確實(shí)不無(wú)道理。數(shù)字通訊是一種趨勢(shì)，它代表了技術(shù)進(jìn)步，是任何人阻擋不了的。雙向數(shù)字通信現(xiàn)場(chǎng)總線信號(hào)制以及由它而產(chǎn)生的巨大的推動(dòng)力，加速現(xiàn)場(chǎng)裝置與控制儀表的變革，開(kāi)發(fā)出越來(lái)越多的功能完善的數(shù)字智能現(xiàn)場(chǎng)裝置。這些都是DCS系統(tǒng)所不具備的，而由此產(chǎn)生的優(yōu)越性以及給火電廠的設(shè)計(jì)、配置、組態(tài)、運(yùn)行、維護(hù)、管理等方面帶來(lái)的效益也是DCS系統(tǒng)所不及的。再則，F(xiàn)CS是由DCS以及PLC發(fā)展而來(lái)，它保留了DCS的特點(diǎn)，或者說(shuō)FCS吸收了DCS多年開(kāi)發(fā)研究以及現(xiàn)場(chǎng)實(shí)踐的經(jīng)驗(yàn)，當(dāng)然也包括教訓(xùn)。由此而得出結(jié)論，“FCS將取代DCS”，似乎也是順理成章之事。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌：ABB???,AB??,GE,FOXBORO,本特利，英維思，伍德沃德，西屋，瑞恩，施耐德，西門子，摩托羅拉，安川。力士樂(lè)。ACSO，橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家
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Kollmorgen PSR4/5A-112 Servo Power Supply Module
ADEPT 90400-20055/xy-?HRS 055-M201AD linear slide
Totoku SCA-01 Saddle Coil Analyzer
AMTECH 900B Ultrasonic Welder Actuator
AB ALLEN-BRADLEY SLC500 10 SLOT PLC
8 ATI 102-B38201 (B) VIDEO CARD
9 PAK-X-TRAC PXT-44A Desoldering & Extraction Tool
STEEL BELT CONVEYOR 120X38”
3 YUSHIN CONAIR HOPI-A750 PLASTIC PROCESS ROBOT ARMS
Hannifin Hydraulic Press
Edmund Buhler SM30A Universal Shaker Orbital
Omron Z4M-N30V Z4M-S30V Z49-C1 Lazer Displacement Sens
FOXBORO 124-FE CONSOTROL AND SCANFOLD
CROUSE-HINDS N5R6352 M89 BREAKER BOX
GE 12SFF11A11A STATIC FREQUENCY RELAY
GE JVM-3 643X POTENTIAL TRANSFORMER
FOXBORO P0700WB NBE NOBE BUS EXTENDER
FOXBORO P0400UP CMP10 COMMUNICATIONS PROCESSOR 10
FOXBORO F6501A-A CONVERTER
GE TS-6631 170M57D7 CRANE CONTACTOR
FIKE903 617016-01 MODULE
FIKE903 9182.434 MODULE
ROSEMOUNT 623785 MICROPROCESSOR BOARD
POWER CIRCUITS FSC4C CONTROLLER
FOXBORO 873 PH/ORP ANALYZER
FOXBORO DM400YL FBM10 120VAC INPUT/OUTPUT MODULE
FOREMOST PEF-II PELLET FEEDER
FOXBORO I/A P0901VK 80MB HARD DRIVE W/ AP20
FOXBORO I/A P0901VK 80MB HARD DRIVE AP20 S/W
FOXBORO I/A P0400VT AP20 APPLICATIONS PROCESSOR 20
FOXBORO 7925050IC MODULE
FOXBORO I/A P0400ZG NODE BUS INTERFACE (NBI)
FOXBORO I/A P0400QK PER TAPE W/CONT
FOXBORO F6501A-A RS485-RS232 Converter
FOXBORO P0960GC WP30 WORKSTATION PROCESSOR 30
ABB SOLID STATE TRIP TYPE SS SS5G
AB ALLEN-BRADLEY SLC150 1745-LP153 PROCESSOR UNIT
3 P&H HARNISCHFEGER 79U5D2 MAG AMP FIRING CONTROL
3 P&H HARNISCHFEGER 79U79 STABILITY MODULE
3 P&H HARNISCHFEGER 79U6D4 BIAS MODULE
METRIC METAL WORK GAS METER IC-1260
ECONO LIFT TR20 TOTE BOX TILTER
FOXBORO 136-1 COMPUTING RELAY
INSUL 8 EQC33B-7 POWEREEL
MOHEAER M4938 BEARING SUPPORT
MOHELLER M4248 KNIFE HOUSING
BARRETT 100-2 REFRACTORY ANCHOR
ELGIN 15829-001 REV A DC POWER SUPPLY
EVERETT CHARLES 4450122-003 CIRCUIT BOARD TESTER
Kahnetics Weller KDS834A Dispensing Systems
Lenze 33.8201-E Drive
CAL-Power M-6175 DC Power Supply
IPITEK RPR-CH Reserve Optical
IPITEK RPR-AUX 24 Auxiliary Power Supply
Hewlett Packard 6459A Analog Power Supply
National Instruments VXI-TB-196
Modicon PC-0984-485 Programmable Controller
專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
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